Re: FreeBSD 8.0 Beta2 / ALC driver crashbase

On Thu, 2009-08-06 at 20:05 -0400, Jim wrote:
> I couldn't get the copy of the if_alc driver to compile in FreeBSD 7.2
> on my new notebook, so I decided to use 8.0, and I found an issue,
> when I boot the installer media CD (boot only or DVD1), I get the
> following error:
> 
> alc0: <Atheros AR8131 PCIe Gigabit Ethernet> irq 16 at device 0.0 on pci7
> alc0: 0x40000 bytes of rid 0x10 res 3 failed (0, 0xffffffffffffffff).
> alc0: cannot allocate memory resources).
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fatal virtual address = 0x08
> fault code = supervisor read data, page not present
> instruction pointer = 0x20:0xffffffff0024c6e8
> stack pointer = 0x20:0xffffffff813f65f0
> frame pointer = 0x20:0xffffffff813f6600
> code segment = base 0x0, limit 0xfffff, type 0x1b
>  = DLP 0, pres 1, long 1, def32 0, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> correct process = 0 (swapper)
> [thread pid 0 tid 100000 ]
> Stopped at   alc_phy_down+0x0:  cmpq  $0,0x8(xrax)
> db>
> 
> 
> I'm not knowledgeable about this to the point where I could debug the
> issue, is there anything I could do to provide the developers with the
> info needed to fix the issue, or could someone tell me how to boot the
> installer and force it to not load if_alc, and suggest give me an idea
> of what this means, in laymans terms so I can try to diagnose it? If I
> had to guess, I would say it's trying to access a chunk of
> memory/address-space that hasn't been allocated or doesn't exist, but
> I don't know if that's correct or where to go from there.

First thing to do, at the "db> " prompt, enter "bt" and show us the
results.  What version of FreeBSD is this?  (8.0-BETA2 I'm assuming?)

There are probably at least two issues here: 1) The allocation shouldn't
fail, but is, and 2) it shouldn't panic.  Getting a backtrace (with "bt"
will hopefully be enough to figure out the second issue, but for the
first one we may need a full verbose dmesg from the system.  Do you have
a serial console hooked up to the machine with which you could obtain
this?

Thanks,

Gavin